Safety device for printing-presses.



W. H. SYLVESTER,

SAFETY DEVICE FOR PRINTING PRESSES.

APPLlCATlOH FILED SEPT. 30, I915.

Patented Jan. 11, 1916.

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WILLIAM H. SYLVESTER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE FIRM 0}? WILLIAM H. SYLVESTER & SONS, OF PHILADELPHIA, PENNSYLVANIA.

SAFETY DEVICE FOR PRINTING-PRESSES.

Application filed. September 30, 1915.

To all whom it may concern Be it known that 1, VILLIAM H. SYLvEs- TER, a citizen of the United States, and a resident of the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Safety Devices for Printing-Presses, of which the following is a specification.

My invention relates to improvements in safety devices for printing presses and the object of my invention is to furnish a device for preventing the hand or arm of the operator from being caught and crushed between the platen and chase during the operation of the machine.

My present invention is particularly adapted for use with fast operating machines, the Golding for instance, the purpose of the invention being to furnish a guard which will not be projected so suddenly, or with such force, as would be apt to bruise or otherwise injure the operator should its top strike him, during its movement of projection.

My invention is illustrated in the accompanying drawings which form part of this specification and in which similar letters of reference indicate similar parts throughout the several views, and in which:

Figure 1, is a perspective view of part of a Golding press fitted with my guard; Fig. 2, a side elevation of the platen, the chase frame and chase, and one of the arms carrying the platen showing the platen and chase in contact and my guard elevated; Fig. 3, a view similar to that shown in Fig. 2, the platen being away from the chase and the safety device retracted.

4 is the platen, 5 the chase, 6 the chase frame, 7 arms carrying the platen, 8 a shaft carrying levers 7, 9 connecting rods carrying shaft 8. All of these parts are well known, form no part of my invention, and will not require detailed description here.

Secured to the ends of the platen 4 are frames 10 having guides 11 and 12 for a rod 13 and carrying pulleys 14 over which pass cords 16, of flexible wire preferably, one end of which are attached to the lower end of rod 13 and the other ends to a suitable connection 15 on the lever 7 The arms Specification of Letters Patent.

Patented Jan. 11, 1916.

Serial No. 53,208.

7 are at one end pivotally carried on shaft 8 and at the other pivotally carry the platen 4:, the positions of these arms in reference to the platen is shown in Figs. 2 and 3, the frame showing the position of the arm when the platen is closed upon the chase, the latter its position when the platen is fully retracted from the chase.

From Fig. 2 it will be seen that when the platen contacts with the chase that the end of the cord 16 is drawn downward so that its other end which is attached to the rod 13 has been drawn upward fully elevating the rod 13. Upon the return movement of the arm the tension upon the cord 16 is slackened and the rod 13 falls by gravity to its fully retracted position which is shown in Fig. 3. Upon the closing movement of the platen, the rod 13 is raised gradually from its fully retracted to its fully extended position and lifts the hand or arm of the operator so that there is no danger of them being caught between the platen and chase when these parts are closed.

17 is a curtain one end connected to rod 13 and the other to a part of the platen frame which when the rod is raised prevents the operator from passing his hand under it where it might be caught between the platen and chase.

The rod 13 is, preferably U shaped, each of its sides are carried in guides upon the sides of the platen frame and both sides are simultaneously operated by the cord and pulley arrangement above described.

Having thus described my invention 1 claim as new and desire to secure by Letters Patent 1. The combination with the reciprocating platen of a printing press and reciprocating arms carrying said platen, of guides carried by the sides of said platen, a U shaped guard carried in said guides, pulleys, and cords passing over said pulleys one of the ends of which are attached to the lower ends of said guard and the other ends of which are attached to said reciprocating carrying arms.

2. The combination with the reciprocating platen of a printing press and the reciprocating arms carrying the same, of frames secured to the ends of said platen, guides and at the other to said platen carrying carried byf said frames, a U shapedd gugrd arms. the ends 0 which pass through sai gui es,

a curtain secured to the uppper part of said WILLIAM SYLVE-STER' guard and to said platen, pulleys carried Witnesses:

by said frames, and cords passing over said CHARLEs A. BUTTER,

pulleys and secured at one end to said frame I. D. STROUP.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

